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Bovine Viral Diarrhoea Virus (view source)
Revision as of 11:37, 24 August 2010
, 11:37, 24 August 2010→Mucosal Disease
====Mucosal Disease====
====Mucosal Disease====
(Brownlie et. al, 2000)
Mucosal disease (MD) primarily affects 6-18 month-old cattle and is invariably fatal (Brownlie et. al, 2000). Baker (1995) summarises the characterising symptoms, which last several days to weeks. These include pyrexia, depression and weakness. Anorexia gives emaciation and dehydration. Foul-smelling, sometimes bloody, watery diarrhoea develops 2-3 days after the onset of disease. Animals are often euthanised for humane reasons.
Mucosal disease is an invariably fatal condition of 6-18 month-old cattle and is invariably fatal<sup>43</sup>. Disease follows a course of several days to weeks, and is characterised by pyrexia, depression, weakness, diarrhoea and anorexia. Emaciation and dehydration arise as a sequel to anorexia, and the diarrhoea is watery, foul-smelling and sometimes bloody. Euthanasia is often warranted.
As suggested by the name, lesions develop on mucosal surfaces including the oral mucosa, tongue, external nares and the buccal and nasal cavities (Brownlie, 1985). Coalition of lesions gives larger areas of necrosis (Baker 1995), leading to excessive salivation, lacrimation, and ocular discharge. The coronet and interdigital surface are also affected, causing the animal to become disinclined to walk and eventually recumbent (Brownlie, 1985). Lesions of the abomasum and small intestine are seen on post-mortem examination, and congestion of the large intestine mucosa results in a stripy, thickened appearance (Brownlie, 1985). Figure 1.5 shows examples of tongue and small intestine lesions.
As suggested by the name, lesions develop on mucosal surfaces including the oral mucosa, tongue, external nares and the buccal and nasal cavities (Brownlie, 1985). Coalition of lesions gives larger areas of necrosis (Baker 1995), leading to excessive salivation, lacrimation, and ocular discharge. The coronet and interdigital surface are also affected, causing the animal to become disinclined to walk and eventually recumbent (Brownlie, 1985). Lesions of the abomasum and small intestine are seen on post-mortem examination, and congestion of the large intestine mucosa results in a stripy, thickened appearance (Brownlie, 1985). Figure 1.5 shows examples of tongue and small intestine lesions.